o f w o r c e s t e r



lf] UNITEDSTATES PATENT oEEiCE. .i

EBENE; wf.i`\I1CHoLS,` 0E WORCESTER, MASSACHUSETTS.

ivroDE oF sEoUEING BEAcE-:BITS 1N THEIR socKETs.`

i Specification of Letters Patent No. 12,868, dated May 175, 1855.

Be it known that IEBENEZER W.fN1oHoLs,

i if ofWorcesterffin the county of Worcester and Statefof Massachusetts, have invented a new and j Improved Mode of Fastening` Auger 'or other Bitstof'Iheir Socket;` and I do hereby .declare that the following is a ull,` clear, and exactdescriptio-n of the same,

j reference being had to Vthe annexed draw-` ings,` makingfa part of this specification; in

Figuremlj` is` aside view of `a bit-stock coni. structed in thejfordinary manner `with this singleeXception-viz the bur nut as seen atl lettera. Fig. `2"is a halfsection otthat part of the bit stocli "in "which the shank of,` the Similar letters of ference indicate corre- `sponding` `parts the several figures.` j f Thenatureofyiny invention" consists in the peculiar method of` fastening the shank of the auger `or.jotherkind of bit intofithe socket ofthe bit-stock so that the alctof boringor `drawing thefauger :ti-ein the holebo'red shall `have no tendency to `loosen the said Shank as `willbe hereafter lfullyshown and described j whereby the auger be `fastened `in Vits place or detached therefrom with the greatest acilityo desired-and when adj usted in its position-verylittle strain comes upon the i fastening of um auger.

j sa 'Io enable othersskilled in theart to fully proceed to` describe xit.

Fig. 2 is ahalf section otthat part of the understand the usejof `1ny inventio-nI will bit-stock which holds the `auger (or bit) h5 inwhich an appropriate opening is made vby a sand core when the bit-stock is cast7 (the inost of which are made of malleable iron.) Said opening extends through Fig.

2 and isof suitable form to receive the bit L by the side of which and about threefourths of an inch from the end of the taper `opening is arecess c against which is a notch d in the bit 7L. i

. Intothe notch Zi'its a corresponding projection d which is brought into its place by means of the bur nut a. 'Io loosen the bit L I unscrew the nut at` and the projection `B `springs back into the recess c by the spring f. j j

`In Fig. 3 may be seen the spring f upon one end the projections B and cZ-upon the other end I cut a screw e and a correspond-A ing thread in the bur nut 1f-in said nut I turn a groove g (Fig. 3) into which I place the set screw g (Fig. 2) which holds the nut stationary endwise and adjusts the `projections B-Z as desired to both fasten and unfasten the bit it. j

I do not claim the projections B,-cZ upon the spring but TWhat I do claiinv and desire to secure by Letters `Patent is- The bur-nut c1, (or its equivalent) in combination with the spring 'f operating upon the wedge principle (by the use of the `screw) the projections BCZ for the purpose and in the manner herein described.

` EBENEZER W. NICHOLS. Witnesses:

A'Mos LYON, l/VM. I-I. BOYDEN. 

